@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

:root {
  color-scheme: light;

  /* ── Vercel surface tokens ─────────────────────── */
  --canvas:              #ffffff;
  --canvas-soft:         #fafafa;
  --canvas-soft-2:       #f5f5f5;
  --surface-dark:        #171717;
  --surface-dark-elevated: #242424;

  /* ── Vercel text tokens ────────────────────────── */
  --ink:         #171717;
  --body:        #4d4d4d;
  --muted:       #888888;
  --muted-soft:  #a1a1a1;
  --hairline:    #ebebeb;
  --on-dark:     #ffffff;
  --on-dark-soft: #888888;

  /* ── Semantic tokens ───────────────────────────── */
  --link:          #0070f3;
  --success:       #0070f3;
  --success-soft:  #d3e5ff;
  --warning:       #f5a623;
  --warning-soft:  #ffefcf;
  --warning-deep:  #ab570a;
  --cyan:          #50e3c2;
  --cyan-deep:     #29bc9b;

  /* ── Stacked shadows (Vercel elevation) ────────── */
  --shadow-1:
    0 0 0 1px rgba(0, 0, 0, 0.08) inset,
    0px 1px 1px rgba(0, 0, 0, 0.02),
    0px 2px 2px rgba(0, 0, 0, 0.04);
  --shadow-2:
    0 0 0 1px rgba(0, 0, 0, 0.08) inset,
    0px 2px 2px rgba(0, 0, 0, 0.04),
    0px 8px 8px -8px rgba(0, 0, 0, 0.04);
  --shadow-3:
    0 0 0 1px rgba(0, 0, 0, 0.08) inset,
    0px 2px 2px rgba(0, 0, 0, 0.04),
    0px 8px 16px -4px rgba(0, 0, 0, 0.04);

  /* ── Typography ────────────────────────────────── */
  --sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--canvas-soft);
  color: var(--body);
  font-family: var(--sans);
}

button,
input,
select {
  font: inherit;
}

/* ── Shell & workspace ─────────────────────────────── */

.app-shell {
  min-height: 100vh;
  padding: 40px 32px 56px;
}

.workspace {
  width: min(1200px, 100%);
  margin: 0 auto;
}

/* ── Intro / header ────────────────────────────────── */

.intro {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--hairline);
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  margin: 0;
  padding: 3px 10px;
  border-radius: 9999px;
  border: 1px solid var(--hairline);
  background: var(--canvas);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 880px;
  margin-bottom: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 3rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.05em;
}

h2 {
  margin-bottom: 0;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h3 {
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.intro p:last-child,
.panel-header p {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ── Panel ─────────────────────────────────────────── */

.panel {
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--canvas);
  box-shadow: var(--shadow-1);
}

.calculator-panel {
  padding: 24px;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

/* ── Ghost / reset button ──────────────────────────── */

.ghost-button {
  flex-shrink: 0;
  min-height: 36px;
  padding: 0 16px;
  border: 1px solid var(--hairline);
  border-radius: 9999px;
  background: var(--canvas);
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}

.ghost-button:hover {
  background: var(--canvas-soft-2);
  border-color: var(--muted-soft);
}

/* ── Input sections ────────────────────────────────── */

.input-sections {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}

.input-section {
  display: grid;
  gap: 16px;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--canvas-soft);
  box-shadow: none;
}

.throughput-inputs {
  background: var(--surface-dark);
  border-color: var(--surface-dark);
  color: var(--on-dark);
}

.section-heading {
  display: grid;
  gap: 6px;
}

.section-heading h3 {
  margin: 0;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.55;
}

.throughput-inputs .section-heading h3 {
  color: var(--on-dark);
}

.throughput-inputs .section-heading p {
  color: var(--on-dark-soft);
}

/* ── Input grid & fields ───────────────────────────── */

.input-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.input-section .input-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.throughput-inputs .input-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field-wide {
  grid-column: 1 / -1;
}

.field {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.field > span {
  color: var(--ink);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.throughput-inputs .field > span {
  color: var(--on-dark);
}

.field-note {
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.45;
}

/* ── 인라인 힌트 툴팁 ───────────────────────────── */

.field-hint {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  margin-left: 4px;
  border: 1px solid var(--muted-soft);
  border-radius: 9999px;
  color: var(--muted);
  font-size: 0.6rem;
  font-weight: 500;
  line-height: 1;
  vertical-align: middle;
  cursor: help;
}

.throughput-inputs .field-hint {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--on-dark-soft);
}

/* 다크 패널 위에서는 툴팁을 밝은 배경으로 반전해 대비를 확보 */
.throughput-inputs .field-hint::after {
  background: var(--canvas);
  color: var(--ink);
}

.throughput-inputs .field-hint::before {
  border-top-color: var(--canvas);
}

.field-hint::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 220px;
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--surface-dark);
  color: var(--on-dark);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.45;
  white-space: normal;
  text-align: left;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.12s ease;
  box-shadow: var(--shadow-3);
  z-index: 20;
}

.field-hint::before {
  content: "";
  position: absolute;
  bottom: calc(100% + 3px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--surface-dark);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.12s ease;
  z-index: 20;
}

.field-hint:hover::after,
.field-hint:focus-visible::after,
.field-hint:hover::before,
.field-hint:focus-visible::before {
  opacity: 1;
  visibility: visible;
}

.throughput-inputs .field-note {
  color: var(--on-dark-soft);
}

/* ── Inputs & selects ──────────────────────────────── */

.input-with-unit,
select {
  display: flex;
  align-items: center;
  min-height: 40px;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: var(--canvas);
}

.throughput-inputs .input-with-unit,
.throughput-inputs select {
  border-color: rgba(255, 255, 255, 0.10);
  background: var(--surface-dark-elevated);
}

.input-with-unit:focus-within,
select:focus {
  border-color: var(--ink);
  outline: 2px solid rgba(23, 23, 23, 0.12);
  outline-offset: 0;
}

.throughput-inputs .input-with-unit:focus-within,
.throughput-inputs select:focus {
  border-color: rgba(255, 255, 255, 0.5);
  outline: 2px solid rgba(255, 255, 255, 0.12);
}

input,
select {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 0.875rem;
}

.throughput-inputs input,
.throughput-inputs select {
  color: var(--on-dark);
}

input {
  padding: 0 0 0 11px;
}

/* 스피너(증감 버튼) 제거 — 직접 타이핑 입력 전용 */
input.no-spin {
  -moz-appearance: textfield;
  appearance: textfield;
}

input.no-spin::-webkit-outer-spin-button,
input.no-spin::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

select {
  padding: 0 11px;
  appearance: auto;
}

.input-with-unit span {
  flex: 0 0 auto;
  padding: 0 11px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  white-space: nowrap;
}

.throughput-inputs .input-with-unit span {
  color: var(--on-dark-soft);
}

/* ── Results grid ──────────────────────────────────── */

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 16px 0 0;
}

/* ── Metric cards ──────────────────────────────────── */

.metric {
  display: grid;
  gap: 8px;
  min-height: 148px;
  padding: 20px;
  border: 1px solid var(--hairline);
  border-radius: 8px;
  background: var(--canvas);
  box-shadow: var(--shadow-2);
}

.metric.primary {
  border-color: var(--surface-dark);
  background: var(--surface-dark);
  color: var(--on-dark);
  box-shadow: none;
}

.metric span,
.metric small {
  color: var(--muted);
  font-size: 0.8125rem;
}

.metric.primary span,
.metric.primary small {
  color: var(--on-dark-soft);
}

.metric strong {
  align-self: center;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
}

.metric.primary strong {
  color: var(--on-dark);
}

.metric small {
  font-size: 0.8rem;
  line-height: 1.45;
}

/* ── Details grid ──────────────────────────────────── */

.details-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
  margin-top: 16px;
}

.details-grid .panel {
  padding: 22px;
  background: var(--canvas);
}

/* ── Detail list ───────────────────────────────────── */

.detail-list {
  display: grid;
  gap: 0;
  margin: 14px 0 0;
}

.detail-list div,
.compression-table [role="row"] {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
  min-height: 44px;
  border-top: 1px solid var(--hairline);
}

.detail-list dt {
  color: var(--muted);
  font-size: 0.84rem;
}

.detail-list dd {
  margin: 0;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.84rem;
  font-weight: 400;
}

/* ── Compression table ─────────────────────────────── */

.compression-table {
  margin-top: 14px;
}

.compression-table [role="row"] {
  grid-template-columns: 1fr 1fr 1fr;
}

.compression-table span {
  min-width: 0;
  font-size: 0.84rem;
}

.table-head {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Confidence badges ─────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: 9999px;
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: uppercase;
  vertical-align: middle;
  line-height: 1.6;
}

.badge--deterministic {
  background: var(--success-soft);
  color: var(--link);
}

.badge--heuristic {
  background: var(--warning-soft);
  color: var(--warning-deep);
}

.metric.primary .badge--deterministic {
  background: rgba(0, 112, 243, 0.2);
  color: #6bb8ff;
}

.metric.primary .badge--heuristic {
  background: rgba(245, 166, 35, 0.2);
  color: #f5a623;
}

/* ── Broker breakdown line ─────────────────────────── */

.breakdown-line {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.8;
  letter-spacing: 0;
}

/* ── Responsive ────────────────────────────────────── */

@media (max-width: 920px) {
  .app-shell {
    padding: 24px 20px 40px;
  }

  .input-grid,
  .results-grid,
  .details-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .input-sections {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.25rem;
  }
}

@media (max-width: 620px) {
  .app-shell {
    padding: 16px 14px 32px;
  }

  .panel-header {
    display: grid;
  }

  .input-grid,
  .input-sections,
  .results-grid,
  .details-grid {
    grid-template-columns: 1fr;
  }

  .input-section .input-grid,
  .throughput-inputs .input-grid {
    grid-template-columns: 1fr;
  }

  .calculator-panel,
  .input-section,
  .details-grid .panel {
    padding: 16px;
  }

  .metric {
    min-height: 120px;
  }

  h1 {
    font-size: 1.9rem;
    letter-spacing: -0.04em;
  }

  .metric strong {
    font-size: 2rem;
  }
}